Really bad anxiety; Whats wrong with me?

I was diagnosed with Intermittent Explosive Disorder about 3/4 years ago and am on lithium and some thyroid medication for hypothyroidism (I've been on a number of other meds before). I am 16 years old. The problem- Everytime I am around people I dont know and in a quiet setting(ex. the SAT test) my stomach makes very loud sounds. Like not even growling but thumping and everyone stares. This only causes me to try to hide the sounds by moving papers or scooting around in my chair which makes them even worse because im so nervous. Idk but it makes me so nervous to be around other people and what theyll think of me. I wasnt always like this :( I couldnt even finish the SAT and got a horrible score because i skipped so much :( This is ruining my life. HELP